Moreover, COVID-19 can also affect the endocrine system, since the angiotensin-converting enzyme 2 (ACE2) receptor—which is responsible together with transmembrane serine protease 2 (TMPRSS2) for the entry of SARS-CoV-2 to the cells—is also expressed in endocrine glands (thyroid, testis, ovary, adrenal, and pituitary) (2, 3). The gene discussed is TMPRSS2; the disease is COVID-19.